This is the same protocol used by SATA SSDs. There are two types of non-Physical Interface: Advanced Host Controller Interface (AHCI) This means you could see a trade-off between interoperability and performance. However its lack of specialization makes programming difficult. PCIe is a multipurpose bus designed to put through all kinds of data to the processor. (Which has a maximum of 25 channels.) This makes it suitable for buffering and caching applications. PCIe SSDs increase performance by getting rid of the SATA interface (Which so far has a maximum of 10 channels.) for PCIe. x16 is recommended for these cards, which can take up to 4 x4 SSDs.) Failing to do so can result in drives not being detected. (For example: 2 x4 SSDs fitted in adapter - x8 PCIe slot or greater is needed.
Note: Using a PCIe adapter card with multiple x4 SSDs? Remember to fit the card in a slot of equal or greater capacity than the total of the cards.
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